at gaza's biggest hospital today, we saw a steady stream of wounded arriving, including children. in the icu, men with traumatic brain injuries. ahmed darmoush, 21, is brain dead, and doctors are not optimistic. are you able to cope if this escalation continues? >> no, no. situation is stable. and if it continue, we can't. of course we can't. >> reporter: israel, however, is ready for a more drawn out fight. it was revealed today that israeli authorities have prepared for seven weeks of fighting. so, diane, these are very tense times on both sides of the border tonight. >> thank you, alex. and now we bring in once again abc's global affairs anchor, christiane amanpour, in j jerusalem tonight. you were there. what did you see all around you today? >> reporter: well, diane, it is absolutely new. we heard this air raid siren go.